Ozone layer

As we know, our planet is surrounded by a large gas layer - the atmosphere. Ozone is one of the gases in the atmosphere that exists. But it is between 20 and 30 kilometers (in the stratosphere) that we can find a greater concentration of this gas.
Ozone is a natural filter very important because it absorbs the ultraviolet radiation emitted by the sun, which are dangerous for living beings; the ozone layer is thus the immune system of the Earth.
The destruction of this layer can have negative effects, such as: the increase in cancer of the skin and problems of vision; the risk of genetic changes in living organisms and flaw in the immune system.
What it doesn’t have to take measures, such as: use only aerosols that have not CFCs; encourage people to have refrigerators, chest, etc. ecological. Because the CFC are gases and are the main destructive of the layer of ozone, which when released into the atmosphere will react with the ozone, causing its destruction.
Today, they are being banned in some countries the manufacture of devices that emit CFCs, because we all want to live in a better world.